Process for preparing nanoscale quinacridone
a quinacridone and nano-scale technology, applied in quinacridones, chemical instruments and processes, organic chemistry, etc., can solve the problems of general unsuitability of quinacridone pigments for inkjet applications, and achieve the effect of increasing the transparency of pain
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example 1
[0024]Sodium chloride (500 g), diethylene glycol (90 g), dimethylquinacridone crude (50 g), and phthalimidomethylquinacridone (2.5 g) were mixed and ground at 85–90° C. for 4 hours, then discharged into 5 liter of water. The resulting water slurry was combined with concentrated hydrochloric acid (13 g) and the pH was maintained below 1.5. The acidic mixture was maintained at a temperature of 85–95° C. for 2½ hours and then cooled to 50° C. After filtration, washing and drying, the resulting quinacridone product had a particle size at about 40–60 nm.
example 2
[0025]Sodium chloride (200 g), diethylene glycol (2.4 g), beta-quinacridone crude (20 g), phthalimidomethylquinacridone (0.6 g), and quinacridone sulfonic acidaluminum salt (0.6 g) were mixed and ground at 85–90° C. for 4 hours, then discharged into 3 liter of water. The resulting slurry was combined with concentrated hydrochloric acid (5 g) and the pH was maintained below 1.5. The acidic mixture was maintained at a temperature of 90–95° C. for 2 hours and then cooled to 50° C. After filtration, the resulting presscake was washed with water to neutralize it and dried at 70–80° C. The resulting quinacridone product was considerably dark and intense in oil rubout and had a particle size ranging from 20–80 nm.
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